(10 ILCS 5/18-15)
(from Ch. 46, par. 18-15)
The poll books shall be enclosed in an envelope, which shall
then be securely sealed with sealing wax, or other adhesive material; and
each of the judges shall write his name across every fold at which the
envelope if unfastened could be opened.
(Source: Laws 1957, p. 1450.)